JPH08311744A - Control of use of compressed air in jet loom and compressed air supplier for use in jet loom - Google Patents

Abstract

PURPOSE: To prevent the generation of a poor weft insertion caused from pressure drop by stopping injection of compressed air when a compressed air supplied from a compressed air supplier drops to a value smaller than a prescribed one. CONSTITUTION: A pressure switch 10 in a compressed air supplier 5 detects pressure in a compressed air supplying path 11 from a compressor 9 to a jet loom 1 and when the pressure drops to a pressure smaller than a prescribed one, a use forbidden criterion circuit 14 outputs an operation stopping signal to a loom-control computer CO. The loom-control computer CO responds to an input of the operation stopping signal and stops a loom driving motor 2, demagnetizes an electromagnetic switch valve 4 and stops air injection from a main nozzle for weft insertion and an auxiliary nozzle for weft insertion.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a compressed air use control method in a jet loom and a compressed air supply device used in the jet loom.

[0002]

2. Description of the Related Art A device for supplying compressed air to a jet loom is disclosed in Japanese Utility Model Laid-Open No. 3-53582 and Japanese Patent Laid-Open No. 3-1049.
No. 62 publication. In the device disclosed in Japanese Utility Model Laid-Open No. 3-53582, a plurality of air supply means having different discharge pressures and a plurality of jet looms are connected by a supply pipe, and switching for selecting conduction between the plurality of air supply means and the jet loom is performed. A valve is provided on the supply pipe. By the switching selection of the switching valve, the air supply means having a desired discharge pressure and the jet room are electrically connected to each other, and the air having a desired discharge pressure is supplied to the jet room.

In the apparatus disclosed in Japanese Patent Laid-Open No. 3-104962, pressure information is output from the pressure regulators of a plurality of jet loom to a controller, and a pressure sensor for detecting the pressure in the tank on the compressed air supply path is used. Outputs pressure information to the controller. The controller calculates two theoretical base pressure values based on the maximum value of the pressure values obtained from the plurality of pressure regulators, and compares these two theoretical base pressure values with the detected pressure value obtained from the pressure sensor. When the detected pressure value exceeds the theoretical base pressure value of the higher one, the controller turns off the compressor, and when the detected pressure value falls below the theoretical base pressure value of the lower side, the controller turns on the compressor. By such ON-OFF control of the compressor, the supply pressure of the compressed air is kept within the set two theoretical base pressure values.

[0004]

If the supply pressure of the compressed air supplied to the jet loom becomes lower than the desired pressure for some reason, the weft insertion will not be carried out properly. However, the above-mentioned conventional device does not disclose any measures against the occurrence of weft insertion failure due to the abnormal decrease in supply pressure.

An object of the present invention is to appropriately control the usage state of compressed air in the jet loom according to the supply pressure of the compressed air fed from the compressed air feeding device for feeding the compressed air to the jet loom.

[0006]

Therefore, according to the invention of claim 1, the supply pressure of the compressed air supplied from the compressed air supply device for supplying the compressed air to the jet loom is detected,
The use of compressed air in the jet loom is stopped when the detected supply pressure drops below a preset pressure.

According to the second aspect of the present invention, the supply pressure of the compressed air supplied from the compressed air supply device for supplying the compressed air to the jet loom is detected, and the detected supply pressure is equal to or lower than the preset pressure. The use of the compressed air in the jet loom is stopped when the time exceeds a preset period.

According to the third aspect of the invention, the use stop of the compressed air is brought about together with the operation stop of the jet loom. According to the invention of claim 4, the supply pressure of the compressed air supplied from the compressed air supply device for supplying the compressed air to the jet loom is detected, and when the detected supply pressure rises above a preset pressure, The use of compressed air in the jet loom was allowed.

According to the invention of claim 5, the use of compressed air is allowed together with the start of operation of the jet loom. According to the invention of claim 6, a compressor for producing compressed air to be supplied to the jet loom, and a pressure detecting means for detecting the supply pressure of the compressed air on the compressed air supply path from the compressor to the jet loom. And a use prohibition judging means for outputting a compressed air use stop signal to the jet loom when the supply pressure detected by the pressure detecting means falls below a preset pressure. Configured.

According to a seventh aspect of the present invention, a compressor for producing compressed air to be supplied to the jet loom and a supply pressure of the compressed air on the compressed air supply path from the compressor to the jet loom are detected. A pressure detecting means, a period detecting means for detecting a period in which the supply pressure detected by the pressure detecting means is equal to or lower than a preset pressure, and a period detected by the period detecting means is a preset period or more. In such a case, the compressed air supply device is provided with the use prohibition judging means for outputting the compressed air use stop signal to the jet loom.

In the invention of claim 8, the compressed air use stop signal is an operation stop signal for stopping the operation of the jet loom. In the invention of claim 9, a compressor for producing compressed air to be supplied to the jet loom, and a pressure detection means for detecting the supply pressure of the compressed air on the compressed air supply path from the compressor to the jet loom. And compressed air having a use permission determination unit that outputs a use permission signal that permits the use of compressed air in the jet loom when the supply pressure detected by the pressure detection unit rises above a preset pressure. The feeding device was constructed.

According to the tenth aspect of the invention, the use permission signal is an operation permission signal for permitting the start of operation of the jet loom. According to the invention of claim 11, the use permission determining means determines whether or not to output the use start permission signal based on the transmission information from the use state transmitting means for transmitting the compressed air use state in the jet loom. I chose

[0013]

According to the first and sixth aspects of the invention, when the detected supply pressure becomes lower than the set pressure, the use of compressed air in the jet loom is stopped. Therefore,
When the detected supply pressure becomes lower than the set pressure, weft insertion of the weft inserted by the injection of compressed air is stopped, and the weft insertion failure due to the pressure decrease does not occur.

According to the second and seventh aspects of the present invention, when the detected supply pressure falls below the set pressure for a period longer than the set period, the weft of the weft inserted by the jet of compressed air. Insertion stops. Therefore, the weft insertion failure due to the pressure decrease does not occur.

According to the third aspect of the present invention, the stop of the use of the compressed air in the jet loom is linked to the stop of the jet loom operation, and the weft insertion is stopped when the loom operation is stopped. In the inventions of claims 4 and 9, when the detected supply pressure rises above a preset pressure, the use of compressed air in the jet loom is permitted. Therefore,
Weft insertion in the jet loom is started after the supply pressure rises above a preset pressure for the first time.

In the eleventh aspect of the present invention, the usage status transmitting means in the jet loom transmits the usage status of the compressed air to the usage permission determining means. When the usage situation is in the weft insertion stop state, the usage allowance determination means allows the compressed air to be used when the detected supply pressure rises above the preset pressure for the first time.

[0017]

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS A first embodiment embodying the present invention will now be described with reference to FIG.
~ It demonstrates based on FIG. Reference numeral 1 is a jet loom, and the loom drive motor 2 is controlled by the loom control computer C ₀ . The loom control computer C ₀ controls the operation of the loom drive motor 2 and the excitation / demagnetization control of the electromagnetic opening / closing valve 4 based on the ON operation of the start switch 3. In the jet loom 1, wefts are ejected into the warp shed by a weft insertion main nozzle (not shown). The weft yarn injected into the warp yarn opening flies in the warp yarn opening by relay injection of a plurality of weft insertion auxiliary nozzles (not shown). In FIG. 1, an electromagnetic on-off valve 4 is an electromagnetic on-off valve for switching the supply and stop of compressed air to the weft insertion main nozzle and an electromagnetic on-off valve for switching the supply and stop of compressed air to the weft insertion auxiliary nozzle. It is shown collectively. The solenoid on-off valve 4 and the pressure regulator 13 are connected in parallel to the weft insertion main nozzle.

Reference numeral 5 is a compressed air supply device. One compressed air supply device 5 is used for each jet room 1. The compressed air supply device 5 includes a discharge flow rate determination circuit 6 and
An inverter 7 that constitutes the discharge flow rate switching means, a pulse motor 8 that constitutes the discharge flow rate switching means, a fixed displacement compressor 9, an open / close differential pressure switch 10 that serves as pressure detection means, and a use prohibition determination circuit. 14 and. The pressure switch 10 detects the pressure on the compressed air supply path 11 from the compressor 9 to the jet loom 1. When the pressure on the supply path 11 exceeds the first reference pressure P ₁ , the pressure switch 10
Turns off. This OFF state is maintained until the pressure on the supply path 11 is reduced to the second reference pressure P ₂ (<P ₁ ). When the pressure on the supply path 11 falls below the second reference pressure P ₂ , the pressure switch 10 is turned on. This ON state is maintained until the pressure on the supply path 11 rises to the first reference pressure P ₁ .

FIG. 2 shows a control circuit of the compressed air supply device 5. The inverter 7 outputs a pulse signal obtained by converting the output frequency of the three-phase AC power supply 12 to the pulse motor 8. The pulse motor 8 rotates at a rotation speed proportional to the conversion frequency, and the fixed displacement compressor 9 discharges compressed air having a volume corresponding to the rotation speed of the pulse motor 8. That is, the discharge flow rate per unit time in the supply path 11 increases as the rotation speed of the pulse motor 8 increases.

The transfer switch 3A constituting the discharge flow rate determining circuit 6 is turned on / off from the loom control computer C _0.
Interlock with the command. The loom control computer C ₀ turns on the transmission switch 3A in response to the ON operation of the starting switch 3. When the operation stop signal S is inputted to the loom control computer C _0, the loom control computer C ₀ is transmitted switches 3A
Turn off.

The use prohibition judging circuit 14 has a normally open contact OP ₁₄
And a period detection circuit 15. If this closed state continues for a set period T ₁ or longer after the normally open contact OP ₁₄ is switched from the open state to the closed state, the period detection circuit 15 outputs an operation stop signal S to the loom control computer C ₀ .

The terminal 7a of the inverter 7 has a common end.
The terminals, terminals 7b, 7c and 7d, are terminals for selecting the conversion frequency.
is there. Curve E in FIG.₁Represents the rotation speed of the compressor 9. Song
Line E₂Is the electrical connection and disconnection between terminals 7a and 7b
It is a curve showing the switching of. Normally closed contact CL in FIG.₁₁
And normally open contact OP_{twenty one}Close together, between terminals 7a and 7b
Connect electrically. Curve E₃Is the voltage between terminals 7a and 7c
It is a curve showing switching of electrical connection and electrical interruption. FIG.
Normally open contact OP₁₂And normally closed contact CL_{twenty two}Closed together
Then, the contacts 7a and 7c are electrically connected. Curve E_Four
Is for switching between electrical connection and electrical disconnection between terminals 7a and 7d
Is a curve that represents. Normally open contact OP₁₃, OP _{twenty three}One is closed
When twisted, the contacts 7a and 7d are electrically connected.

When the contacts 7a and 7b, the contacts 7a and 7c, and the contacts 7a and 7d are all electrically cut off, the inverter 7 does not output a pulse signal. Contacts 7a, 7
b is electrically cut off, between contacts 7a and 7c and contact 7
When a and 7d are electrically connected to each other, the inverter 7 outputs a pulse signal having a conversion frequency that sets the rotation speed of the compressor 9 to N ₃ . Between contacts 7a and 7b and contacts 7a and 7
When the d is electrically connected and the contacts 7a and 7c are electrically disconnected, the inverter 7 converts the rotation speed of the compressor 9 to the second rotation speed N ₂ (> N ₃ ) and outputs a pulse signal of a conversion frequency. Is output. Between contacts 7a, 7b and setting 7a,
When the 7c is electrically disconnected and the contacts 7a and 7d are electrically connected, the inverter 7 converts the rotation speed of the compressor 9 into the first rotation speed N ₁ (> N ₂ ) and is a pulse signal of a conversion frequency. Is output.

Curve E of FIG._FiveIs ON of transmission switch 3A
-Indicates OFF state. ON-OFF of transmission switch 3A
The state is ON-OF of the start switch 3 of the jet room 1.
Corresponds to F state. Curve E₆Is pressure switch 10 ON
-Indicates OFF state. Curve E ₇Is the pressure on supply path 11
Represents fluctuation. Jet loom 1 is shut down and compressed
The pressure on the supply line 11 when the machine 9 is inactive.
Is a low pressure close to the atmospheric pressure, and a differential switching type pressure switch
The switch 10 is in the ON state. Time t₀Is a three-phase AC power supply 1
2 represents the time of input. When the three-phase AC power supply 12 is turned on,
Relay CR₁Is excited and the normally closed contact CL₁₁Is opened,
Normally open contact OP₁₂, OP₁₃Closes. Contact 7 in this state
Electrical disconnection between a and 7b, contact between contacts 7a and 7c, and contact
The points 7a and 7d are electrically connected. That is, three-phase
When the flow power source 12 is turned on, the compressor 9 rotates at the rotation speed N.₃Times
Start turning. The compressed air is supplied by the operation of the compressor 9.
It is supplied to the jet room 1 via 11.

Straight line E₈Is the operation stop from the period detection circuit 15
Indicates that the stop signal S is not output. The pressure on the supply path 11 is
Reference pressure P of 1₁Pressure switch 10 is turned off
And relay CR₁Demagnetizes. Relay CR₁Degauss
And normally closed contact CL₁₁Is closed and the contact is normally open.₁₂,
OP₁₃Opens. In this state, between the contacts 7a and 7b, the contact 7
Electrical disconnection between a and 7c and between contacts 7a and 7d
It becomes a state. Therefore, the inverter 7 outputs the pulse signal
To stop the operation of the compressor 9. On supply route 11
The compressed air of the
Supplied to cheats. The pressure regulator 13 is the second reference pressure.
Power P₂Much lower pressure P ₀Is set to. Pressure
Force adjuster 13 has pressure P₀Compressed air of higher pressure than
Power P₀Depressurize to and supply to the main nozzle for weft insertion. This
Supply air pressure P from main weft insertion nozzle₀Jetted at
I do. Pressure P₀Is the low pressure and the tip of the weft is waiting for weft insertion.
The end position is straightened by low pressure air injection.
It When the weft insertion is waiting,
Contributes to the prevention of error.

When the operation of the compressor 9 is stopped, the pressure on the supply path 11 is reduced. When the pressure on the supply path 11 falls below the second reference pressure P ₂ , the pressure switch 10 is turned on and the compressor 9 starts rotating at the rotation speed N ₃ . Therefore, when the transfer switch 3A is in the OFF state, that is, the start switch 3
The pressure on the supply path 11 when the switch is in the OFF state is the first
Between the set pressure P ₁ and the second set pressure P ₂ .

Time t ₁ is when the transmission switch 3A is ON. In the case shown in the figure, the pressure on the supply path 11 at the time t ₁ is in the reduced pressure state, and the contact points 7a and 7b, the contact point 7a,
Both 7c and the contacts 7a and 7d are in an electrically disconnected state. That is, the compressor 9 is not in operation. ON transfer switches 3A is a result, relay CR ₂ is energized, the normally open contacts OP _21, OP ₂₃ is closed, the normally closed contact CL ₂₂ is opened. In this state, between the contacts 7a and 7b and between the contacts 7a and 7d
Is electrically connected, and the contacts 7a and 7c are electrically disconnected. That is, when the starting switch 3 is turned on while the pressure on the supply path 11 is in the reduced pressure state, the compressor 9 rotates at the second rotation speed N ₂ .

When the start-up switch 3 is turned on, the loom control computer C ₀ operates the loom drive motor 2 and also controls the excitation / demagnetization of the electromagnetic opening / closing valve 4. Due to the demagnetization of the electromagnetic on-off valve 4, the weft insertion main nozzle and the weft insertion auxiliary nozzle respectively inject air within a predetermined rotation angle range during one rotation of the jet loom. By this air injection, weft insertion is performed. The amount of compressed air consumed by the weft inserting air injection exceeds the amount of compressed air supplied from the compressor 9 operating at the _second rotation speed N ₂ , and the pressure on the supply path 11 decreases. When the pressure on the supply path 11 falls below the second reference pressure P ₂ , the relay CR ₁ is excited. Normally closed contact C when both relays CR ₁ and CR ₂ are energized
L ₁₁ , CL ₂₂ open, normally open contacts OP ₁₂ , OP ₁₃ , O
P _21, OP ₂₃ is closed. In this state, the contacts 7a and 7b and the contacts 7a and 7c are electrically cut off, and the contact 7
Electrical connection is established between a and 7d. Therefore, the compressor 9
Rotates at a _first rotation speed N ₁ . The amount of compressed air consumed by the weft inserting air jet from the weft inserting main nozzle and the weft inserting auxiliary nozzle is less than the amount of compressed air supplied from the compressor 9 operating at the _first rotation speed N ₁ . Therefore, the pressure on the supply path 11 increases.

The pressure on the supply path 11 is the first reference pressure P.
_When it exceeds ₁ , the relay CR ₁ is demagnetized. Therefore, both relays CR ₁ and CR ₂ are switched from the excitation state to relay CR ₁ being demagnetized and relay CR ₂ is changed to the excitation state, and compressor 9 is decelerated from _first rotation speed N ₁ to second rotation speed N ₂ . To do.
Due to this deceleration, the pressure on the supply path 11 is reduced from the _first reference pressure P ₁ toward the second reference pressure P ₂ . That is, the supply path 1 when the activation switch 3 is in the ON state
The pressure on 1 is the first reference pressure P ₁ and the second reference pressure P _2.
Stipulated between and.

The discharge flow rate determining circuit 6 is an ON-O switch of the transmission switch 3A, which serves as a usage status transmission means for reflecting the pressure detection status of the pressure switch 10 and the usage status of the jet room 1.
The rotation speed of the pulse motor 8 is controlled in four stages based on the FF state. That is, when the start-up switch 3 is in the OFF state, the discharge flow rate setting circuit 6 sets the discharge flow rate specifying mode in which the rotation speed of the compressor 9 is set to 0 based on the comparison between the _two reference pressures P ₁ and P ₂ and the detected pressure, It is determined to be one of the discharge flow rate specifying modes with N ₃ . Further, when the start switch 3 is in the ON state, the discharge flow rate setting circuit 6 has two reference pressures P ₁ and P 2.
Based on the comparison between ₂ and the detected pressure, the first discharge flow rate regulation mode in which the rotation speed of the compressor 9 is set to the second rotation speed N _2, and the rotation speed of the compressor 9 is set to the first rotation speed N ₁ . It is determined to be one of the second discharge flow rate regulating modes to be performed.

When the start-up switch 3 is in the ON state, consumption of compressed air in the jet loom 1 is large. If the compressed air supply is controlled by ON-OFF control of the compressor when the compressed air consumption is large, a sudden decrease in the supply pressure of the compressed air cannot be avoided. A sharp drop in supply pressure causes weft insertion errors. In this embodiment, if the two set rotational speeds N ₁ and N ₂ of the compressor 9 are properly selected, the reference pressure P
The width between ₁ and P ₂ can be narrowed, and fluctuations in the air injection pressure for weft insertion can be restricted to a range that does not hinder good weft insertion. Moreover, the pressure fluctuation on the supply path 11 is caused by the reference pressure P.
_It is regulated between ₁ and P ₂ so that the supply pressure does not drop sharply.

The reference pressures P ₁ and P ₂ are determined in consideration of the type of weft, the rotation speed of the jet loom, etc., but when the reference pressures P ₁ and P ₂ are changed, the rotation speed of the compressor 9 is also changed. It is desirable to change. The inverter 7 that constitutes the discharge flow rate switching means together with the pulse motor 8 that serves as the variable speed drive motor facilitates the selective setting of the rotation speed of the compressor 9.

There is a possibility that the supply pressure may remain lower than the reference pressure P ₂ for some reason such as the occurrence of a compressor abnormality or pressure leakage. If the supply pressure continues to decrease abnormally, weft insertion may not be performed well, and the weft may not reach a predetermined position at the end of the weft insertion. A weft detector for detecting the arrival of the weft is installed at a predetermined position of the weft end, and when the weft does not reach the predetermined position of the weft end, the weft detector sends an operation stop signal to the loom control computer C _0. Output to. Alternatively, even when the weft reaches a predetermined position at the end of the weft insertion, the weft insertion posture of the weft may be poor and the fabric quality may be deteriorated.

Curve E of FIG.₇₁Is driving jet room 1
The supply pressure is inside the reference pressure P₁It decreases without reaching
An example is shown. In this example, the pressure switch 10 is at time t₂so
After turning on, the supply pressure is the reference pressure P₁Without boosting to
Sub pressure P₂If a pressure leak occurs
Is assumed. When the pressure switch 10 is turned on,
Ray CR₁Is excited and the normally open contact OP₁₄Closes. Normally open contact
Point OP₁₄Is closed for a set period T₁Turned into an open state
For example, the period detection circuit 15 does not output the operation stop signal S.
Normally open contact OP₁₄Is closed for a set period T₁If the above continues,
The interval detection circuit 15 outputs the operation stop signal S. Curve E₈₁
Is the output of the operation stop signal S from the period detection circuit 15
Represents Curve E₁₁, E_{twenty one}, E₃₁, E₄₁, E₅₁, E₆₁Is a song
Line E₁, E ₂, E₃, E_Four, E_Five, E₆Corresponding to
I do. In FIG. 4, time t₂The pressure switch 10 turns on.
Set period T₁Pressure switch 10 is turned off until later
Normally open contact OP₁₄Is closed for a set period T₁that's all
Continue. Therefore, the period detection circuit 15 has time t₂Set from
Period T₁After time t₃The operation stop signal S to the loom control controller
Pewter C₀Output to.

In response to the input of the operation stop signal S, the loom control computer C ₀ gives an instruction to stop the operation of the loom drive motor 2 and demagnetize the electromagnetic on-off valve 4, and also to turn off the transmission switch 3A. Therefore, OFF relay CR ₂ is demagnetized by the transfer switch 3A, with the normally closed contact CL ₂₂ is closed, opens the normally opened contact OP _21, OP ₂₃ is rotated at a rotational speed N ₃ is the pulse motor 8 at time t ₃ after To do.
Further, the air injection in the main weft inserting nozzle and the auxiliary weft inserting nozzle is stopped, and the operation of the jet loom 1 is stopped. Appropriate control of the usage state of the compressed air in the jet loom is performed such that the injection of the weft insertion air is stopped when the supply pressure is abnormally reduced, so that the occurrence of the weft insertion error is avoided.

In this embodiment, the pressure switch 10 for keeping the supply pressure within the proper pressure range [P ₁ , P ₂ ] is used for proper control of the usage state of the compressed air in the jet loom 1. The configuration in which the expensive pressure switch 10 is also used for appropriately controlling the usage state of the compressed air in the jet loom 1 is advantageous in reducing the cost of the compressed air supply device. Moreover, the adoption of the single pressure detector brings about simplification of the piping configuration of the supply path 11 as compared with the case where a plurality of pressure detectors are used.

Next, a second embodiment shown in FIGS. 5 to 7 will be described. Members having the same configurations as those in the first embodiment are designated by the same reference numerals. In the compressed air supply device 5A of this embodiment, the supply pressure on the supply path 11 is detected by the pressure switch 16. The detected supply pressure is the set pressure P
_When it becomes ₃ or more, the pressure switch 16 is turned on. The set pressure P ₃ is slightly lower than the reference pressure P ₂ . The use allowance determination circuit 17 outputs an operation allowance signal H to the loom control computer C ₀ when the pressure switch 16 is turned on.
A curve E _{9 in} FIG. 7 represents whether or not the operation permission signal H is output.
The loom control computer C ₀ enters a state in which the ON signal from the start switch 3 is validated while the operation allowance signal H is being input. When the start switch 3 is turned on in this standby state, the loom control computer C ₀ commands the operation of the loom drive motor 2 and the excitation / demagnetization control of the electromagnetic on-off valve 4 for weft insertion.

When the detected supply pressure does not reach the set pressure P ₃ , the pressure switch 16 is operated by the use permission judgment circuit 17
No ON signal is output to the loom control computer 17 and the operation permission signal H is not output to the loom control computer C ₀ . Therefore, when the supply pressure does not reach the set pressure P ₃ for some reason such as an abnormality of the compressor or a pressure leak, weft insertion is not started. Set pressure P ₃ is only slightly lower than the reference pressure P _2, the injection pressure of the air for weft insertion if the supply pressure set pressure P ₃ can be regarded as substantially proper injection pressure. When the supply pressure is insufficient, the use of compressed air in the jet loom is appropriately controlled by prohibiting the start of injection of the weft insertion air, so that the occurrence of weft insertion errors due to an abnormal supply pressure is avoided.

Next, a third embodiment shown in FIGS. 8 to 10 will be described. Members having the same configurations as those in the second embodiment are designated by the same reference numerals. In the compressed air supply apparatus 5B of this embodiment, the two switching detection circuits 18 and 19 are ON-OF of the pressure switch 10.
In response to the F switching, the switching detection signal F is used as the prohibition judging circuit 2
Output to 0. The switching detection circuit 18 has a normally open contact OP.
₁₅ and a pulse signal output circuit 21. The switching detection circuit 19 includes a normally closed contact CL ₁₅ and a pulse signal output circuit 22.
Consists of The pulse signal output circuit 21 has a normally open contact OP ₁₅
Outputs a pulse-shaped switching detection signal F when the switch from open to closed, and the pulse signal output circuit 22 outputs the normally closed contact CL.
_{When 15} is switched from open to closed, it outputs a pulsed switching detection signal F. The curve E _{10 in} FIG. 10 is the switching detection signal F.
Indicates whether or not the output of.

The input interval of the switching detection signal F is the set period T ₂
In the above case, the use prohibition judging circuit 20 outputs the operation stop signal S to the loom control computer C ₀ .
When the input interval of the switching detection signal F does not reach the set period T ₂ , the use prohibition judging circuit 20 does not output the operation stop signal S. The set period T ₂ is longer than the ON-OFF switching interval of the pressure switch 10 during the normal operation of the jet loom 1. As shown by the curve E ₇₂ in FIG. 10, when the supply pressure abnormally decreases and the ON-OFF switching interval of the pressure switch 10 reaches the set period T ₂ , the use prohibition determination circuit 20 outputs the operation stop signal S. To do. When the supply pressure is insufficient, the use of compressed air in the jet loom is appropriately controlled by prohibiting the start of injection of the weft insertion air, so that the occurrence of weft insertion errors due to an abnormal supply pressure is avoided.

The present invention can also be applied to operation control of a weft processing device as disclosed in JP-A-7-90755. In this type of weft processing device, the succeeding weft is ejected from the main nozzle for weft insertion without cutting and separating the weft that has made a weft insertion error and the subsequent weft, and the injected following weft is blocked as well. It is diverted from the weft insertion route to the weft drawing route. Then, the weft that has made a weft insertion error is pulled out and removed from the front of the woven fabric by using the succeeding weft that has been prevented from being inserted as a clue. The weft insertion of the succeeding weft is blocked by an air flow that is directed in a direction intersecting the weft insertion path, and the suction air flow is also used when removing the weft that has been misinserted. If the pressure of the compressed air used in such a weft processing device is abnormally lowered, the weft yarn in which the weft insertion is mistaken cannot be accurately removed from the front of the woven fabric. When the supply pressure is abnormally decreased, the operation of the weft processing apparatus is prohibited based on the detection of the abnormal decrease in the supply pressure as in the above-described embodiment, or the supply pressure is set to the set pressure (in the case of the second embodiment). When the pressure is equal to or higher than the set pressure P ₃ ), the operation of the weft yarn processing device may be permitted to be performed. In this case, the signals output from the use prohibition determination circuits 14 and 20 become the compressed air use stop signal, and the use permission determination circuit 1
The signal output from 7 becomes a use start permission signal.

Further, in the present invention, an embodiment in which compressed air is supplied from one compressed air supply device to a plurality of jet looms in which the same type of fabric is woven is also possible.

[0043]

As described above in detail, since the use of compressed air in the jet loom is stopped when the supply pressure abnormally drops, an abnormal occurrence in the jet loom due to the abnormal drop in the supply pressure is prevented. Can be prevented.

Since the use of compressed air in the jet loom is allowed when the supply pressure rises above the set pressure, it is possible to prevent the occurrence of abnormalities in the jet loom due to an abnormal drop in the supply pressure.

[Brief description of drawings]

FIG. 1 is a control block diagram showing a first embodiment embodying the present invention.

FIG. 2 is a control circuit diagram in the compressed air supply device.

FIG. 3 is a timing chart showing fluctuations in the rotation speed and supply pressure of the compressor.

FIG. 4 is a timing chart showing fluctuations in the rotation speed and supply pressure of the compressor.

FIG. 5 is a control block diagram showing a second embodiment.

FIG. 6 is a control circuit diagram in the compressed air supply device.

FIG. 7 is a timing chart showing fluctuations in rotation speed and supply pressure of the compressor.

FIG. 8 is a control block diagram showing a third embodiment.

FIG. 9 is a control circuit diagram in the compressed air supply device.

FIG. 10 is a timing chart showing fluctuations in the rotation speed and supply pressure of the compressor.

[Explanation of symbols]

DESCRIPTION OF SYMBOLS 1 ... Jet loom, 3A ... Transmission switch which comprises use status transmission means, 5, 5A, 5B ... Compressed air supply device,
9 ... Compressor, 10 ... Pressure switch as pressure detecting means,
Reference numeral 11 ... Supply path, 14, 20 ... Use prohibition judging circuit serving as use prohibition judging means, 15 ... Period detecting circuit serving as period detecting means, 16 ... Pressure switch serving as pressure detecting means, 17 ...
A use allowance judging circuit serving as use allowance judging means, C ₀ ... A loom control computer constituting a use status transmitting means.

 ─────────────────────────────────────────────────── ─── Continuation of the front page (72) Inventor Hirohiko Ishikawa 2-chome, Toyota-cho, Kariya City, Aichi Stock Company Toyota Industries Corp.

Claims (11)

[Claims] 1. A jet loom when a supply pressure of compressed air supplied from a compressed air supply device for supplying compressed air to a jet loom is detected and the detected supply pressure drops below a preset pressure. Method for controlling compressed air use in a jet loom for stopping the use of compressed air in. 2. A preset period is a period during which the supply pressure of the compressed air supplied from a compressed air supply device for supplying the compressed air to the jet loom is detected and the detected supply pressure is equal to or lower than a preset pressure. A compressed air use control method in the jet loom in which the use of the compressed air in the jet loom is stopped in the case of the above. 3. The method for controlling the use of compressed air in a jet loom according to claim 1, wherein the stop of use of the compressed air is brought about together with the stop of the operation of the jet loom. 4. A jet loom when the supply pressure of compressed air supplied from a compressed air supply device for supplying compressed air to a jet loom is detected and the detected supply pressure rises above a preset pressure. Method for controlling compressed air use in a jet loom that allows the use of compressed air in a jet. 5. The method of controlling compressed air use in a jet loom according to claim 4, wherein the permission to use the compressed air is brought together with the permission to start the operation of the jet loom. 6. A compressor for producing compressed air to be supplied to a jet loom, and pressure detection means for detecting a supply pressure of compressed air on a compressed air supply path from the compressor to the jet loom. Compressed air for use in a jet loom, which includes a use prohibition determination means for outputting a compressed air use stop signal to the jet loom when the supply pressure detected by the pressure detection means falls below a preset pressure. Supply device. 7. A compressor for producing compressed air to be supplied to a jet loom, and pressure detection means for detecting a supply pressure of the compressed air on a compressed air supply path from the compressor to the jet loom. A period detection unit that detects a period in which the supply pressure detected by the pressure detection unit is equal to or lower than a preset pressure, and a jet when the period detected by the period detection unit is equal to or greater than the preset period. A compressed air supply device for use in a jet room, comprising a use prohibition judging means for outputting a compressed air use stop signal to the room. 8. The compressed air use stop signal is an operation stop signal for stopping the operation of the jet loom.
And a compressed air supply device used for the jet loom according to claim 7. 9. A compressor for producing compressed air to be supplied to a jet loom, and pressure detection means for detecting a supply pressure of the compressed air on a compressed air supply path from the compressor to the jet loom. Used in a jet room equipped with a use allowance determining means for outputting a use allowance signal allowing use of compressed air in the jet room when the supply pressure detected by the pressure detecting means rises above a preset pressure. Compressed air supply device. 10. The compressed air supply device for use in a jet loom according to claim 9, wherein the use permission signal is an operation permission signal for permitting operation of the jet loom. 11. The use permission determining means determines whether or not to output the use permission signal based on transmission information from a use situation transmitting means for transmitting a compressed air use situation in a jet loom. A compressed air supply device used for the jet loom according to claim 10.